The Zwicky Transient Facility (ZTF; Bellm et al. 2019; Graham et al. 2019) Superluminous Supernova Science Program (Lunnan et al. 2020; Yan et al. 2020; Chen et al. 2022a,b) reports 11 candidate SLSNe, following the methodology outlined by Perley et al. (in prep.) We selected transients that have a long rise time (>20 days) and a faint host galaxy.
We summarise properties of the candidates in the Related Objects Table. These include coordinates, current magnitudes, approximate rise times, photometric redshifts of potential host galaxies (taken from the SDSS DR14) and special remarks.
We will distribute alerts on such SLSN candidates via AstroNotes periodically; spectroscopic classifications and additional follow-up observations of these transients are encouraged.
This report is based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2022nze [ZTF22aaocgho] | 21:20:43.452 | +12:13:11.27 | First detection ~65 days ago. It showed a ~40 days plateau and now it is declining very slowly. Current magnitude in r ~20 and in g ~20.1. No host galaxy has been detected at the limits of Legacy Survey. | 21:20:43.452 | +12:13:11.27 | ||||||
| TNS | 2022mdg [ZTF22aaivpxa] | 16:44:47.815 | +10:58:18.50 | It was detected ~110 days ago. Slow rise for ~80 days and the current magnitudes are r ~20.3 and g ~20.9. No galaxy has been detected in the location of the explosion in the LS. | 16:44:47.815 | +10:58:18.50 | ||||||
| TNS | 2022kji [ZTF22aagecyn] | 22:04:39.566 | +41:43:54.96 | First detection 130 days ago close to the ZTF limits. It may have been rising for 15 days and it had been undulating around a plateau for 90 days. It is positionally coincident with a faint PS1 galaxy. Currently r ~19.8 and g ~19.9. | 22:04:39.566 | +41:43:54.96 | ||||||
| TNS | 2022ngz [ZTF22aaotdwb] | 16:59:52.565 | +44:40:50.79 | SDSS J165952.66+444050.6 | It was first detected ~55 days ago. It had been rising for more than 30 days and now it is declining. Current magnitude r ~20.3. It is slightly offset from a galaxy with SDSS photometric redshift of 0.28 ± 0.09, which would imply a peak magnitude ~ -20.5. | 16:59:52.565 | +44:40:50.79 | |||||
| TNS | 2022npq [ZTF22aarqrxf] | 16:21:03.732 | +14:50:54.84 | First detection 55 days ago. It has been rising for 55 days and still going. Currently r ~18.6. A faint counterpart is located at the position of the transient with SDSS photo z ~ 0.96 ± 0.17. | 16:21:03.732 | +14:50:54.75 | SLSN-I | 0.26 | ||||
| TNS | 2022ofw [ZTF22aarwule] | 21:55:40.585 | +21:50:36.22 | First detection ~42 days ago. It shows a gradual rise for 15 days followed by a plateau for 15 days. It is declining and the current magnitudes are r ~20 and g ~20.2. It is offset from a SDSS galaxy with photo z ~ 0.15 ± 0.10, implying a peak magnitude ~ -20. | 21:55:40.585 | +21:50:36.22 | ||||||
| TNS | 2022opm [ZTF22aasousd] | 22:11:17.169 | +29:18:01.87 | It was detected ~40 days ago. Fast rise for ~12 days followed by a slower ongoing rise. Currently, r ~19.6 and g ~19.8. It seems slightly offset from a galaxy in SDSS and LS but there is no reported redshift. | 22:11:17.169 | +29:18:01.87 | SLSN-II | 0.249 | ||||
| TNS | 2022nwe [ZTF22aaorkba] | 21:38:20.963 | -00:12:49.27 | First detection 65 days ago. It had been rising for ~65 days and it is still going. Extended spiral host galaxy detected in SDSS with photo z ~0.23 ± 0.04, implying a peak magnitude ~-20.7. | 21:38:20.966 | -00:12:49.24 | ||||||
| TNS | 2022lvm [ZTF18aasyjhd] | 14:49:17.642 | +27:16:47.89 | SDSS J144917.62+271648.5 | Unusual object. It was detected ~70 days ago. Very fast rise (~10 days) followed by a long plateau (~40 days) and now it is declining. The photo z of the SDSS galaxy is 0.16 ± 0.04 which would imply a peak magnitude in the r band ~-20.7. | 14:49:17.630 | +27:16:48.04 | SN II | 0.143 | |||
| TNS | 2022msv [ZTF22aanuapl] | 18:19:11.493 | +41:01:02.49 | It was detected ~70 days ago. It had been rising for ~30 days and the current magnitude is g ~20.2. It seems to be offset from a galaxy within a cluster. The LS photo z of the galaxy is poorly constrained (0.2 ± 0.15) and it would imply a peak magnitude of ~-20.5. | 18:19:11.493 | +41:01:02.49 | SN IIn | 0.154 | ||||
| TNS | 2022lvq [ZTF22aaknucy] | 18:25:30.806 | +30:43:09.73 | First detection ~90 days ago and it had been rising for ~10 days followed by a plateau phase for ~50 days. It started declining 30 days ago. A faint counterpart has been detected in LS and PS1 but there is no reported redshift. Currently, r ~20.8. | 18:25:30.806 | +30:43:09.73 |
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